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y - 2 = -2(x - 0)
y - 2 = -2x
y = -2x + 2
atau
y + 2x - 2 = 0
atau
y + 2x = 2
Melalui titik = (0,2)
Persamaan :
y -y₁ = m(x -x₁)
y -2 = -2(x -0)
y -2 = -2x +0
y = -2x +2
2x +y = 2
2x +y -2 = 0
Jadi, persamaannya adalah 2x +y -2 = 0.